6,7,8,9,10,11-Hexahydro-13H-azocino[2,1-b]quinazolin-13-one

The title compound, C(14)H(16)N(2)O, is a synthetic analogue of quinazolone alkaloids with pyrrilo, pyrido and azopino rings. The quinazolinic part of the mol-ecule is generally planar within 0.037 (3) Å; the eight-membered ring exhibits an inter-mediate conformation between the chair and boat forms as it is typical for cyclo-octene rings. An ethyl-ene group of the azopino ring is disordered over two positions with a refined occupancy ratio of 0.910 (7):0.090 (7). In the crystal, the H atoms of the aromatic rings form weak C-H⋯O and C-H⋯N hydrogen bonds. One C-H⋯O hydrogen bond leads to the formation of a one-dimensional chain. Another C-H⋯O and a C-H⋯N bond link these chains, generating a three-dimensional network.